Does it pass the smell test?

Odor assessors use their sensitive noses to sniff out environmental violations

In the odor laboratory at Chongqing Jiangbei Environment Monitoring Station, a panel of six assessors prepare to evaluate gas samples based on their smell alone.

For the next four to five hours, they cannot talk to each other and must individually assess each sample by the intensity of its odor, its duration and offensiveness.